WINDOWS8 host upgrade patch will sometimes appear black screen, Safe mode can not enter, you may use the following method to solve
1, boot continuous F8 Select Safe mode after choosing to repair your computer, choose Troubleshooting;
2, choose to restore the computer;
3, click Next;
4. Select the accounts that need to be restored;
5, at this time need to enter a password;
6, then insert WINDOWS8 installation CD-ROM or u disk, waiting for repair can be completed.
When the user's host can go into safe mode, you can refer to Knowledge Base 077382, enter the Safe mode settings, and then uninstall the updated patches before the problem is resolved.